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		<h1>[name]</h1>

		<p class="desc">

			This class represents an abstraction of the WebXR Device API and is internally used by [page:WebGLRenderer].
			[name] also provides a public interface that allows users to enable/disable XR and perform XR related tasks like
			for instance retrieving controllers.
		</p>

		<h2>Properties</h2>

		<h3>[property:Boolean cameraAutoUpdate]</h3>
		<p>
		Whether the manager's XR camera should be automatically updated or not. Default is *true*.
		</p>

		<h3>[property:Boolean enabled]</h3>
		<p>
		This flag notifies the renderer to be ready for XR rendering. Default is *false*. Set it to *true* if you are going
		to use XR in your app.
		</p>

		<h3>[property:Boolean isPresenting]</h3>
		<p>
		Whether XR presentation is active or not. Default is *false*. This flag is read-only and automatically set by [name].
		</p>

		<h2>Methods</h2>

		<h3>[method:ArrayCamera getCamera]()</h3>
		<p>
		Returns an instance of [page:ArrayCamera] which represents the XR camera of the active XR session.
		For each view it holds a separate camera object in its [page:ArrayCamera.cameras cameras] property.
		</p>
		<p>
		The camera's *fov* is currently not used and does not reflect the fov of the XR camera. If you need the fov on app level,
		you have to compute in manually from the XR camera's projection matrices.
		</p>

		<h3>[method:Group getController]( [param:Integer index] )</h3>
		<p>
		[page:Integer index] — The index of the controller. <br /><br />

		Returns a [page:Group] representing the so called *target ray* space of the XR controller.
		Use this space for visualizing 3D objects that support the user in pointing tasks like UI interaction.
		</p>

		<h3>[method:Group getControllerGrip]( [param:Integer index] )</h3>
		<p>
		[page:Integer index] — The index of the controller. <br /><br />

		Returns a [page:Group] representing the so called *grip* space of the XR controller.
		Use this space if the user is going to hold other 3D objects like a lightsaber.
		</p>

		<p>
		Note: If you want to show something in the user's hand AND offer a pointing ray at the same time, you'll want to attached the handheld object to the
		group returned by [page:.getControllerGrip]()  and the ray to the group returned by [page:.getController](). The idea is to have two different groups
		in two different coordinate spaces for the same WebXR controller.
		</p>

		<h3>[method:Group getHand]( [param:Integer index] )</h3>
		<p>
		[page:Integer index] — The index of the controller. <br /><br />

		Returns a [page:Group] representing the so called *hand* or *joint* space of the XR controller.
		Use this space for visualizing the user's hands when no physical controllers are used.
		</p>

		<h3>[method:String getReferenceSpace]()</h3>
		<p>
		Returns the reference space.
		</p>

		<h3>[method:XRSession getSession]()</h3>
		<p>
		Returns the *XRSession* object which allows a more fine-grained management of active WebXR sessions on application level.
		</p>

		<h3>[method:void setFramebufferScaleFactor]( [param:Float framebufferScaleFactor] )</h3>
		<p>
		[page:Float framebufferScaleFactor] — The framebuffer scale factor to set.<br /><br />

		Specifies the scaling factor to use when determining the size of the framebuffer when rendering to a XR device.
		The value is relative to the default XR device display resolution. Default is *1*. A value of *0.5* would specify
		a framebuffer with 50% of the display's native resolution.
		</p>

		<p>
		Note: It is not possible to change the framebuffer scale factor while presenting XR content.
		</p>

		<h3>[method:void setReferenceSpaceType]( [param:String referenceSpaceType] )</h3>
		<p>
		[page:String referenceSpaceType] — The reference space type to set.<br /><br />

		Can be used to configure a spatial relationship with the user's physical environment. Depending on how the user moves in 3D space, setting an
		appropriate reference space can improve tracking. Default is *local-floor*.
		Please check out the [link:https://developer.mozilla.org/en-US/docs/Web/API/XRReferenceSpaceType MDN] for possible values and their use cases.
		</p>

		<h3>[method:void updateCamera]( [param:PerspectiveCamera camera] )</h3>
		<p>
		Updates the state of the XR camera. Use this method on app level if you set [page:.cameraAutoUpdate] to *false*.
		The method requires the non-XR camera of the scene as a parameter. The passed in camera's transformation is automatically
		adjusted to the position of the XR camera when calling this method.
		</p>

		<p>
		Note: It is not possible to change the reference space type while presenting XR content.
		</p>

		<h2>Source</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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